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2005
Chalcogens
I 0038
24- 024
Electrochemical Preparation of H2S and H2Se. — The title compounds are synthesized in high yields by electrolysis of aqueous H2SO4 (0.05 M) solutions containing
K2SO4 using composite electrodes prepared by melting mixtures of elemental S or Se
and graphite powders. The method makes the in situ preparation of the poisonous and
often unstable title compounds much simpler on the laboratory scale, and may even be
useful on a larger scale. The accurate control of generation rate via the current allows
to produce just the quantity of hydride needed. Using more than one electrode, mixtures
of these hydrides can be generated with fine control over the composition. —
(BASTIDE, S.; HUEGEL, P.; LEVY-CLEMENT, C.; HODES, G.; J. Electrochem.
Soc. 152 (2005) 3, D35-D41; Lab. Chim. Metall. Terres Rares, CNRS, F-94320 Thiais,
Fr.; Eng.) — W. Pewestorf
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